glusterfsd: handle logfile path specification appropriately.

when logfile path is not specified as absolute path, the symbolic
link created to the logfile (only in invocation of glusterfs with
--run-id) might end up as a broken symbolic link.

for example, command-line invocation like below will result in
broken symbolic link:
glusterfsd -f /home/glusterfs/volfiles/nufa/nufa.vol
-l ../home/glusterfs/logs/nufa.f1.log --run-id nufatest /mnt/nufa/

symbolic link will be created at $PWD/../home/glusterfs/logs/nufa.f1.log
will have a value of ../home/glusterfs/logs/nufa.f1.log.<date>.<time>.<pid>.
this symlink might be broken.

Signed-off-by: Anand V. Avati <avati@dev.gluster.com>

BUG: 156 (Broken symbolic link when relative path is given for a log file)
URL: http://bugs.gluster.com/cgi-bin/bugzilla3/show_bug.cgi?id=156

1 files changed, 8 insertions, 1 deletions

diff --git a/glusterfsd/src/glusterfsd.c b/glusterfsd/src/glusterfsd.c
index 6f976bacb..d658c0e09 100644
--- a/glusterfsd/src/glusterfsd.c
+++ b/glusterfsd/src/glusterfsd.c
@@ -1021,6 +1021,8 @@ main (int argc, char *argv[])
 	call_pool_t      *pool = NULL;
 	struct stat       stbuf;
 	char              tmp_logfile[1024] = { 0 };
+	char              *tmp_logfile_dyn = NULL;
+        char              *tmp_logfilebase = NULL;
 	char              timestr[256] = { 0 };
 	time_t            utime;
 	struct tm        *tm = NULL;
@@ -1130,13 +1132,18 @@ main (int argc, char *argv[])
 			
 			/* Create symlink to actual log file */
 			unlink (cmd_args->log_file);
-			ret = symlink (tmp_logfile, cmd_args->log_file);
+
+                        tmp_logfile_dyn = strdup (tmp_logfile);
+                        tmp_logfilebase = basename (tmp_logfile_dyn);
+			ret = symlink (tmp_logfilebase, cmd_args->log_file);
                         if (-1 == ret) {
                                 fprintf (stderr, "symlink of logfile failed");
                         } else {
                                 FREE (cmd_args->log_file);
                                 cmd_args->log_file = strdup (tmp_logfile);
                         }
+
+                        FREE (tmp_logfile_dyn);
 		}
 	}